final_exam_04

package final_exam_04;
import java.util.*;

public class MyFruitList<E> extends ArrayList<E>
{
    public static void main(String[] args)
    {
        MyFruitList<Fruit> fruts = new MyFruitList<Fruit>();
        fruts.add(new Fruit());
        fruts.add(new Fruit());

        MyFruitList<Apple> apps  = new MyFruitList<Apple>();
        apps.add(new Apple());
        apps.add(new Apple());

        MyFruitList<GreenApple> gapps  = new MyFruitList<GreenApple>();
        gapps.add(new GreenApple());
        gapps.add(new GreenApple());

        System.out.println(fruts.count());
        System.out.println(fruts);
        copyAll(fruts,apps);
        System.out.println(fruts.count());
        System.out.println(fruts);
        copyAll(fruts,gapps);
        System.out.println(fruts.count());
        System.out.println(fruts);
    }

    public int count()
    {
        return this.size();
    }

    public static <E,T> void copyAll(ArrayList<E> a , ArrayList<T> b)
    {
        ArrayList<Object> c = (ArrayList<Object>)a;
        c.addAll(b);
    }
}

class Fruit extends Object
{
    private static int id;
    private int myid;
    Fruit()
    {
        myid = id;
        id++;
    }
    public String toString()
    {
        return "Fruit"+myid;
    }
}


class Apple extends Fruit
{
    private static int id;
    private int myid;
    Apple()
    {
        myid=id;
        id++;
    }
    public String toString()
    {
        return "Apple"+myid;
    }
}

class GreenApple extends Apple
{
    private static int id;
    private int myid;

    GreenApple()
    {
        myid=id;
        id++;
    }
    public String toString()
    {
        return "GreenApple"+myid;
    }

}